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Diffstat (limited to 'lib/find_bit_benchmark.c')
-rw-r--r--lib/find_bit_benchmark.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/lib/find_bit_benchmark.c b/lib/find_bit_benchmark.c
index 67b19233c28f..5985a25e6cbc 100644
--- a/lib/find_bit_benchmark.c
+++ b/lib/find_bit_benchmark.c
@@ -35,6 +35,7 @@
#define SPARSE 500
static DECLARE_BITMAP(bitmap, BITMAP_LEN) __initdata;
+static DECLARE_BITMAP(bitmap2, BITMAP_LEN) __initdata;
/*
* This is Schlemiel the Painter's algorithm. It should be called after
@@ -103,6 +104,22 @@ static int __init test_find_last_bit(const void *bitmap, unsigned long len)
return 0;
}
+static int __init test_find_next_and_bit(const void *bitmap,
+ const void *bitmap2, unsigned long len)
+{
+ unsigned long i, cnt;
+ cycles_t cycles;
+
+ cycles = get_cycles();
+ for (cnt = i = 0; i < BITMAP_LEN; cnt++)
+ i = find_next_and_bit(bitmap, bitmap2, BITMAP_LEN, i+1);
+ cycles = get_cycles() - cycles;
+ pr_err("find_next_and_bit:\t\t%llu cycles, %ld iterations\n",
+ (u64)cycles, cnt);
+
+ return 0;
+}
+
static int __init find_bit_test(void)
{
unsigned long nbits = BITMAP_LEN / SPARSE;
@@ -110,23 +127,29 @@ static int __init find_bit_test(void)
pr_err("\nStart testing find_bit() with random-filled bitmap\n");
get_random_bytes(bitmap, sizeof(bitmap));
+ get_random_bytes(bitmap2, sizeof(bitmap2));
test_find_next_bit(bitmap, BITMAP_LEN);
test_find_next_zero_bit(bitmap, BITMAP_LEN);
test_find_last_bit(bitmap, BITMAP_LEN);
test_find_first_bit(bitmap, BITMAP_LEN);
+ test_find_next_and_bit(bitmap, bitmap2, BITMAP_LEN);
pr_err("\nStart testing find_bit() with sparse bitmap\n");
bitmap_zero(bitmap, BITMAP_LEN);
+ bitmap_zero(bitmap2, BITMAP_LEN);
- while (nbits--)
+ while (nbits--) {
__set_bit(prandom_u32() % BITMAP_LEN, bitmap);
+ __set_bit(prandom_u32() % BITMAP_LEN, bitmap2);
+ }
test_find_next_bit(bitmap, BITMAP_LEN);
test_find_next_zero_bit(bitmap, BITMAP_LEN);
test_find_last_bit(bitmap, BITMAP_LEN);
test_find_first_bit(bitmap, BITMAP_LEN);
+ test_find_next_and_bit(bitmap, bitmap2, BITMAP_LEN);
/*
* Everything is OK. Return error just to let user run benchmark